Anyone implement Cortex A9 FIQ

[Frank Li]

>
> Whether this is feasible will really depend on what platform you're on - if
> there's a secure monitor then FIQs are out of the question anyway. Can you
> tell us more about the system?

Freescale MX6Q.

>
> If your average interrupt latency is low then you should just be able to do
> this with normal IRQs (have you got threaded interrupt handlers?)

Not all drivers use threaded interrupt handler.

>
> What is it about the situation that leads you to believe that you *need*
> FIQ?

FIQ can be executed even in spin_lock_saveirq.
We want do very small hardware set at related precision period (every 125us).

>
> Jonny
>
>
>